论文部分内容阅读
认识和掌握小麦生长发育的规律,是实行科学种田的依据。小麦产量是穗数、粒数、粒重三个因素构成的。这三个因素中,穗数多少,是由分蘖多少和分蘖成穗率高低决定的。冬小麦在出苗后半个月左右开始分蘖,越冬前基本停止或完全停止,返青以后又继续进行,起身拔节前达到高峰,以后就向两极分化,大蘖迅速成长,小蘖逐渐死亡,在大田条件下,分蘖死亡率多达60—70％。这是植株体内营养物质分配和代谢中心的变化所造成的。在分蘖期间,特别在返青以前,主茎或早期形成的大蘖所吸
Understanding and mastering the law of wheat growth and development, is the basis for the implementation of scientific farming. Wheat yield is the number of spikes, grain number, grain weight composed of three factors. Among these three factors, the number of spikes is determined by the number of tillers and the rate of tillers to spike. Winter wheat began tillering about half a month after emergence, basically stopped or completely stopped before the winter, returned to green and then continued. After getting up to the peak, it became polarized. The big tiller grew rapidly and the small tiller died gradually. Under the conditions, tillering mortality as much as 60-70%. This is caused by changes in nutrient distribution and metabolic centers in plants. During tillering, especially before returning to green, main stems or early-formed big tillers inhale